RESEARCHES UPON THE CHEMICAL PROPERTIES OF GASES. 



187 



1. Meactions in Solution. 



REAGENTS. REACTIONS. 



Palladium chloride Quickly reduced. No carbon dioxide is formed. 



Platinum chloride , . . • Unchanged. 



Gold chloride Quickly reduced. No carbon dioxide is evolved in the 



cold or at 100°. 



Silver nitrate Unchanged. 



Ammoniacal silver nitrate Unchanged. 



Rhodium chloride Unchanged. 



Potassium rutheniate Quickly reduced. 



Cerium dioxide in dilute sulphuric acid Rapidly bleached. 



Potassium permanganate, neutral Turns brown. 



Potassium permanganate acidulated with dilute sul- Quickly bleached. 



phuric acid. 



Potassium permanganate crystals in concentrated sul- Prompt oxidation of the gas to carbon dioxide. 



phuric acid. 



Chromic acid solution Unchanged. 



Osmic acid Quickly reduced, metallic osmium being precipitated. 



Ferric chloride. . Unchanged. 



Bromine water Promptly but incompletely absorbed. 



Peroxide of hydrogen No formation of carbon dioxide. 



Potassium ferricyanide Unchanged. 



Calcium hypobromite containing excess of lime water. . Unchanged. 



Iodine dissolved in iodide of potassium solution Quickly bleached. 



Mercurous nitrate Precipitation of a gray powder which consists of (or 



changes into) metallic mercury. 



Sulphuric acid of 1.8 specific gravity Does not absorb isobutylene in the cold. 



2. Reactions at High Temperatures. 



Experiments upon the reducing action of isobutylene upon metallic oxides at 

 high temperatures did not develop any characteristic differences. 



Iodic acid was reduced by isobutylene at 89°, with formation of carbon dioxide 

 and free iodine. 



Comments. — Isobutylene prepared by Puchot's method from isobutyl alcohol 

 causes a white precipitate in ammoniacal silver nitrate solution, while that prepared 

 from isobutyl iodide and potash exerts no such action. 



The reaction towards mercurous nitrate (of the second class) distinguishes be- 

 tween isobutylene and the olefines lower in carbon. In its bleaching action upon 

 iodine dissolved in iodide of potassium solution, isobutylene differs from both ethy- 

 lene and propylene and also in the fact that it bleaches cerium dioxide in sulphuric 

 acid solution. It is not oxidized to carbon dioxide by any of the reagents in solu- 

 tion, with the exception of permanganate of potash in strong sulphuric acid. 



